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This paper illustrates a secure and reliable system for remotely controlling electrical appliances by Short Messaging Service (SMS) and/or internet. The system requires serial interfacing of two micro-controllers with SIEMENS AX75 cell phone and a personal computer respectively. A microcontroller unit was used to merge the independent subsystems for SMS and internet based control. The micro-controllers were programmed in C and a webpage was created using PHP for internet based controlling. The proposed parallel controlling system incorporates user verification and registration, password protection and RF communication between central controller and the remote receiver segments. The overall scheme offers advantages over so far reported rigid control systems, which involve high cost GSM or GPRS modems. Also the proposed scheme can serve the purpose of appliance controlling in a large scale.
Date of Conference: 18-19 May 2012